Background According to the 2016 World Malaria Report, the malaria incidence in Haiti declined by > 40% between 2010 and 2015. Though elimination efforts have likely contributed, this time period also corresponded to a national change in diagnostic methods. Methods Monthly reports of aggregated patient data were acquired from five clinics in the Ouest Department of Haiti. Generalized linear models were used to compare the number of febrile patients tested, the number of positive tests, and the proportion of tests that were positive (TRP) before and after the national adoption of rapid diagnostic tests (RDTs). Results Prior to the earthquake when microcopy was used for diagnosis, a total of 1,727 patients with 557 (32.3%) positive; post-earthquake testing was reduced and the TPR was variable; during the post recovery period when RDTs were used exclusivly, a total of 5,132 patients were tested using RDTs, only 83 (1.62%) were positive. Compared to the pre-earthquake period, there was a 69% increase in the number of patients tested (IRR: 1.69; 95% CI IRR 1.59, 2.79), and a 97.0% decrease in the proportion of patients with a positive test result (IRR: 0.03; 95% CI IRR 0.02, 0.04) in the post-recovery period. Conclusions While the decline in malaria indicators between 2010 and 2015 has been cited as evidence of progress towards elimination, these reports derived estimates of the malaria burden in Haiti using two different diagnostic tests. Thus, comparison of these periods in the context of malaria elimination should be made with caution.

Elimination or more accurate estimation? Investigation of trends in malaria diagnoses in the Ouest Department of Haiti from 2008 to 2017

June
Elimination or more accurate estimation? Investigation of trends in malaria diagnoses in the Ouest Department of Haiti from 2008 to 2017
Thomas A. Weppelmann 0 1
Caroline J. Stephenson 0
Elisha Musih 0
John B. Dame 0
Marie Y. Remy 0
Robert Nicolas 0
Michael E. von Fricken 0
0 Editor: Michelle L. Gatton, Quensland University of Technology , AUSTRALIA
1 Herbert Wertheim College of Medicine, Florida International University , Miami, FL , United States of America, 2 Department of Global and Community Health, George Mason University , Fairfax, VA , United States of America, 3 College of Veterinary Medicine, University of Florida , Gainesville, FL , United States of America, 4 African Methodist Episcopal Church Service and Development Agency, Inc. , Washington, DC , United States of America
-
Data Availability Statement: All relevant data are
within the paper and its Supporting Information
files.
Funding: This study was conducted with internal
funds provided by the College of Health and
Human Services, George Mason University given
to MEV. The funders had no role in study design,
data collection and analysis, decision to publish, or
preparation of the manuscript.
Methods
Results
Prior to the earthquake when microcopy was used for diagnosis, a total of 1,727 patients
with 557 (32.3%) positive; post-earthquake testing was reduced and the TPR was variable;
during the post recovery period when RDTs were used exclusivly, a total of 5,132 patients
were tested using RDTs, only 83 (1.62%) were positive. Compared to the pre-earthquake
period, there was a 69% increase in the number of patients tested (IRR: 1.69; 95% CI IRR
1.59, 2.79), and a 97.0% decrease in the proportion of patients with a positive test result
(IRR: 0.03; 95% CI IRR 0.02, 0.04) in the post-recovery period.
Conclusions
While the decline in malaria indicators between 2010 and 2015 has been cited as evidence
of progress towards elimination, these reports derived estimates of the malaria burden in
Competing interests: The authors have declared
that no competing interests exist.
Haiti using two different diagnostic tests. Thus, comparison of these periods in the context
of malaria elimination should be made with caution.
Background
Hispaniola, consisting of Haiti and the Dominican Republic, is the only remaining island in
the Caribbean with endemic malaria, with more than 95% of all cases reported from Haiti [
1
].
In response, a bi-national plan between Haiti and the Dominican Republic was created to
eliminate malaria by the year 2020 [
2
]. To reach this goal, Haiti has implemented several
policies, including the recommendation to combine single dose primaquine with standard
chloroquine therapy for confirmed malaria patients in order to block gametocyte transmission,
efforts to strengthen reporting and surveillance, and a change in the diagnostic method from
microscopy of blood smears to the use of rapid diagnostic tests (RDTs) [
2
]. Prior to 2012,
malaria diagnosis in Haiti was exclusively based on results from parasitological microscopy of
blood smears from suspected patients, which are highly dependent upon the type of equipment
used and the level of training of the microscopist [
3
]. After the 2010 earthquake, the use of
malaria RDTs was temporarily approved for 90 days [
4
], setting the groundwork for the
permanent adoption of RDTs as the primary method of diagnosis in 2012. The Haitian
government, in partnership with the United States Centers for Disease Control and Prevention
(CDC), approved three brands of RDTs for use in Haiti. These brands exclusively target
histidine-rich protein II antigen (HRP2) expressed by Plasmodium falciparum and were found to
have sensitivity between 84±100% and specificity between 91±94% during in-country
performance testing [
5
]. RDTs are now used countrywide for malaria diagnosis, which are reported
to the MSPP (Ministère de la SanteÂ Publique et de la Population) to derive estimates of the
disease burden of malaria in Haiti [
6
].
This change in policy has corresponded with a large reduction in the number of confirmed
malaria cases reported to the MSPP; with the 2016 World Malaria Report estimating a 40%
reduction in incidence of malaria between 2010 and 2015 [
1
]. While some have attributed this
reduction to the bi-national elimination plan, few malaria control strategies have actually been
implemented [7±8]. Furthermore, due to natural disasters much of the country's public health
infrastructure was incapacitated during this time period [
9
]. The goal of this study was to
investigate the trends in the number of malaria diagnostic tests given, the number of positive
results, and the test positive rate before the earthquake when microscopy was used and during
the recovery period after the national adoption of malaria RDTs.
Methods
Study location and clinic characteristics
Hospital records were obtained from facilities within the African Methodist Episcopal Church
Service and Development Agency (AME-SADA), a non-profit network of medical clinics in
the Ouest Department of Haiti headquartered in Washington, DC [
10
]. These included Fond
Baptiste, LeÂger, and Pont Matheaux from the commune of Arcahaie (estimated population
118,501); along with Bellanger and Source Matelas from the commune of Cabaret (estimated
population 62,063). The geographic locations of the five clinics are presented in Fig 1 with
respect to the national administrative boundaries of Haiti. The clinic located in Pont Matheaux
is the largest location with 9,277 patient visits per year; whereas the other four clinics are
satellite locations that often serve less developed areas with a combined total of 2,298 patient visits
2 / 13
Fig 1. Geographical location of medical clinics from the Ouest Department of Haiti. The geographical locations of the clinics within the African Methodist Episcopal
Church Service and Development Agency (AME-SADA) network are presented with respect to the national administrative boundaries (departments in inset,
communes in map). These include Fond Baptiste, Leger, and Pont Matheaux from the commune of Arcahaie (estimate population 118,501); along with Bellanger and
Source Matelas from the commune of Cabaret (estimated population 62,063).
per year. The clinical network reports statistics to the MSPP in the form of standardized
monthly reports that are aggregated by the departmental headquarters for the Ouest
Department (Department Sanitaire De L'Ouest) to generate national-level health statistics [
11
]. These
data included the number of febrile patients tested for malaria and the number of malaria tests
with a positive result.
Data extraction. Monthly records were available from the AME-SADA clinics in the
form aggregated patient data between the years 2008 to 2013. After obtaining the reports, two
researchers independently extracted the data into a spreadsheet using Microsoft Excel
(Microsoft Corp., Redding, WA, USA). The fields extracted included the name of the clinic
submitting the report, the month of the report, year of report, total number of patient visits that
month, number of patients tested for malaria each month, and the number of positive malaria
tests. After data entry, the spreadsheets generated by both researchers were compared for
3 / 13
inconsistencies, which were checked against the original documents until both were in
complete agreement prior to the analyses as described in the subsequent section. Rainfall data
reported in inches per month between January 1st, 2008 to January 1st, 2017 were obtained
from the Tropical Rainfall Measuring Mission (TRMM) for the area corresponding to the
Arcahiae Arrondissement (polygon bounded by the following coordinates -72.859 E, 18.655 S,
-72.178 W, 19.166 N) [
12
].
Time series data structure. The resulting data are the total number of patients tested for
malaria, number of positive malaria tests, and the total amount of precipitation in inches by
month. As shown in Fig 2, the data can be conceptually separated into three approximately
equal periods of time with complete records from January 2008 to September 2010 (months
1±32), frequently missing or incomplete reports between September 2010 and September 2013
(months 33±69), and complete data from September 2013 to January 2017 (months 70±108).
During the first period of time from January 2008 to September 2010, a standardized
microscopy protocol endorsed by the World Health Organization was the only method of malaria
diagnosis used at the AME-SADA clinics [
13
]. Data from the second period of time between
Fig 2. Monthly totals of malaria diagnostic tests, positive results, and rainfall. The monthly totals of malaria diagnostic tests used (black), number of positive test
results (red), and rainfall in inches (blue) between January 1, 2008 to January 1, 2017 are presented. The shaded region in the top two plots represents a period of
incomplete records and/or reduction of services between September 2011 and September 2013 following a period of disaster.
4 / 13
The number of febrile patients tested for malaria, the number of positive tests, and test positive rate (TR) are presented by month for all available data. Between 2008 and
2011 microscopy was used to diagnose malaria infections; during years 2013 to 2017 diagnosis was made exclusively with rapid diagnostic tests. The data are presented
for individuals clinics, separately for clinics that did not conduct both microscopy and RDTs, and all clinics combined.
September 2010 and September 2013 (months 33±69) correspond to the months that followed
the January 2010 earthquake, onset of the cholera outbreak in October 2010, and Hurricane
Sandy in October of 2012; all of which interrupted medical services. During the third period of
time from September 2013 to January 2017, AME-SADA clinics exclusively used the CareStart
Malaria HRP2 rapid diagnostic test (Access Bio, Inc., Monmouth Junction, New Jersey, USA)
to diagnose all suspected malaria patients.
Comparison of malaria diagnostic testing over time. Descriptive summaries of the
number of patients tested for malaria and the number of positives tests were generated by time
period for individual clinics, for small and large clinics separately, and for all clinics combined
(Table 1). The number of positive results was divided by the number of febrile patients tested
for malaria to calculate a test positive rate (TPR) expressed as a percentage (%). Generalized
linear models (GLM) with a Poisson distribution were used to model the number of febrile
patients tested for malaria, the number of positive tests, and the test positive rate (TPR). The
association between the study time period and the three aformentioned outcomes was
explored using only data from the clinics that tested patients before and after the adoption of
RDTs (Bellanger and Pont Mattheux). First, the three time periods were coded as categorical
variables representing the pre-earthquake period (coded 1), the post-disaster period (coded 2),
and the post-recovery period (coded 3). The number of febrile patients tested per month was
compared using the period as a categorical predictor and included all three time periods. The
number of positive tests per month was compared using the time period as a categorical
predictor and the number of febrile patients tested as a covariate. The TPR by month was
compared using the time period as a categorical predictor and the number of febrile patients tested
as an offset to express the TPR as a rate. Due to variability in the TPR during months where
few patients were tested, the comparison of the the number of positive tests and the TPR
included only the months where at least 20 febrile patients were tested. Since the changes in
season could have influenced the TPR or increased the number of febrile patients tested, the
default model was also evaluated with the inclusion of a seasonal term. Fourier terms (two
pairs of sine and cosine functions) computed by dividing the time elapsed in months (T) by
12, multiplication by 360 degrees, and inclusion in the previous model as a third term
representing the product of the sine and cosine functions with time. All model coefficients were
expressed as incidence rate ratios (IRRs) with 95% confidence intervals and statistical
significance denoted by an alpha value of 0.05. All statistics were conducted using STATA
(Stata
Corp, College Station Texas, USA).
5 / 13
Results
Comparison trends in malaria diagnoses before and after the adoption of
RDT
In the clinical network, the number of febrile patients tested increased from 1,727 patients
between January 2008 and October 2011 to 5,132 between January 2014 and September 2016.
Despite an increase in testing, the number of positives decreased from 557 to 83 confirmed
malaria diagnoses during the same time period, corresponding to a decrease in the TPR from
32.25% to 1.62% (Table 1). From Table 1 it is also evident that prior to adoption of RDTs, only
two clinics (Pont Matheaux and Bellanger) were able to perform microscopy to diagnose
malaria. The adoption of the RDT led to an increase in the number of febrile patients tested by
Fond Baptiste, LeÂger, and Source Matelas (Table 1). Since not all clinics had the capacity to
diagnose malaria before and after the adoption of RDTs, a comparison of the number of tests
given and the TPR was conducted using time-series data from Pont Matheaux and Bellanger
(Table 2).
The number of febrile patients tested for malaria was significantly different (P< 0.001)
between the three pre-defined time periods from January 2008 to January 2017 (Fig 3).
Between January 2008 and October of 2011 the clinics tested approximately 53 (95% CI 42±63)
febrile patients per month. In the post-disaster period that followed the earthquake (Jan.
2010), a national cholera outbreak (Oct. 2010) and hurricane Sandy (Oct. 2012) contributed to
the reduction in healthcare capacity. Compared to the pre-earthquake period, the number of
febilre patients tested for malaria decreased to less than 10 (95% CI: 5,9) per month;
corresponding to an 87% reduction (IRR: 0.13; 95% CI: 0.11, 0.15) in the post-disaster period. By
2014, the clinics had recovered from the various disasters and began to test over 80 (95% CI:
74±98) patients per month between January 2014 to January 2017; correpsonding to an
increase in the number of patients tested by approximately 70% (IRR: 1.69; 95% CI: 1.59, 1.79)
compared to the pre-earthquake period. Adjusting for the effect of season, the differences in
the number of febrile patients tested compared to the pre-earthquake season was similar, with
a 84% decrease in the number of patients tested in the post-disaster period (95% CI: 0.13,
0.20), and a 2.5 fold increase in the number of patients tested during the post-recovery period
(95% CI: 2.06, 3.09).
The number of febrile patients tested for malaria, the number of positive tests, and test positive rate (TPR) with 95% confidence intervals are presented by year for the
two clinics (Bellanger and Pont Mattuex) conducting malaria diagnoses in all three study periods. Due to missing data, the number of months available is included in
the first column; months with less than 20 tests given are included in this table. Microscopy was used exclusively to diagnose febrile patients with malaria until 2012; by
2013 both clinics had completey adopted the RDT for diagnosis of malaria.
6 / 13
Fig 3. The number of suspected malaria patients tested before, during, and after the earthquake. The number of patients tested for malaria infections at Bellanger
and Pont Matthuex between January 1, 2008 and January 1, 2017 are presented (gray dots) with reference to three national disasters (black diamonds) including an
earthquake in January 2010, cholera outbreak in October 2010, and hurricane Sandy in Mar 2012. The number of tests were modeled as three discrete time periods:
before the earthquake (January 2008 to September 2011), post-disaster (September 2011 to September 2013), and post-recovery (September 2013 to January 2017);
which are shown with (solid black line) and without (dashed black line) inclusion of a seasonal component in the model. Months with less than 20 patients tested appear
as hollow gray circles.
The number of febrile patients with a positive test result was also significantly different
(P<0.001) between the three pre-defined study time periods; with an monthly average number
of confirmed diagnosis of 17 people (95%CI: 12, 22) during the pre-earthquake period, 2
people (95% CI:1,3) during the post-disaster period, and 1 person (95%CI: 1, 2) in the
post-recovery period. As expected, the number of positive tests was associated with the number of tests
given during the same month (P< 0.001). Once included as a covariate, the model was able to
predict over 85% of the variability (R2 = 0.85) in the number of positive tests over time (Fig 4).
The plot of the actual and predicted number of positive tests also shows separation of the data
into two discrete clusters corresponding to period 1 where microscopy was used and period 3
where RDTs were used. Compared to time period 1, there was a 98% reduction in the number
of positive tests in period 3 (IRR 0.022; 95% CI 0.015, 0.33). This decrease in the number of
positive tests and increase in the number of tests given resulted in a TPR of 32.3% (95% CI
7 / 13
Fig 4. Actual and predicted number of positive tests before and after the adoption of RDTs. The actual number of positive tests and number of positive tests
predicted from the regression model are shown along with a linear fit with a 95% confidence interval. Two clusters emerge, the values from period 1 (squares) when
microscopy was used and the values from period 2 (circules), once RDTs were adopted. Period 2 was omitted from the regression due to large amounts of missing data
or months with less than 20 febrile patients tested for malaria.
26.5, 37.2%), 17.3% (95% CI 7.9, 26.8%), and 0.9% (95% CI 0.4, 1.57%) for time periods 1, 2,
and 3, respectively (Fig 5). The TPR was variable in the post-disaster period and not
significantly different (P = 0.12) than the pre-earthquake period; where 76% of months had missing
data or tested less than 20 patients. Compared to the pre-earthquake period when microscopy
was used exclusively, there was over a 95% decrease in the likelihood of a positive test during
the post-recovery period (IRR: 0.03; 95% CI: 0.02, 0.04); when rapid diagnostic tests were used
exclusively. After adjustment for the effect of season, the difference in the number of febrile
patients with positive results in the post-recovery period compared to the pre-earthquake
season was unchanged (IRR = 0.019; 95% CI: 0.01, 0.04).
Discussion
Using monthly data collected before and after the adoption of malaria RDTs in Haiti, this
study was able to demonstrate that the drastic reduction in malaria indicators occurred as
8 / 13
Fig 5. Test positive rate (TPR) before, during, and after the earthquake. The percentage (%) of diagnostic tests with a positive result (gray circles) between January 1,
2008 and January 1, 2017 are presented with the values predicted without a seasonal component included in the model (dashed red line). Months with less than 20
patients tested appear hollow gray circles with gaps in the dotted background for those months.
early as September 2013. Furthermore, the rates from this sample of Haitian clinics were
almost identical to those reported for the entire country in 2010 and 2015 from the 2016
World Malaria Report [
1
]. In 2010 the WHO reported that 270,427 microscopic diagnoses
were performed in Haiti with 84,153 confirmed positive (31.1%); whereas in 2015 the number
of RDTs used was 233,081 with 12,359 confirmed positive (5.3%). From the clinics offering
testing before and after the adoption of the RDT (Table 1), the number of microscopic
diagnoses was 1,727 with 557 confirmed positive (32.3%); whereas after the policy change, the
number of RDTs used was 3,291 with 36 confirmed positive (1.09%). Though few studies have
compared the ability of laboratory technicians at Haitian clinics to diagnose malaria by
microscopy to trained experts, one study reported the positive predictive value (PPV) of only
22.2% [
14
]. Since this PPV means the local operators overestimated the actual number of
patients with malaria by almost five-fold, it is plausible that the reduction in the number of
reported malaria cases from 31.1% in 2010 to 5.3% in 2015 was due to the adoption of a more
specific method of diagnosis.
Besides the temporary approval of three brands of RDT in 2010 and permanent adoption
by 2012, other elements of the bi-national plan to eliminate malaria from Haiti must be
9 / 13
considered in the context of this drastic decline. Concurrent with the adoption of the RDT, the
recommended treatment protocol for uncomplicated malaria throughout Haiti was changed
from standard chloroquine therapy (25 mg/kg total, administered over 3 days) to combined
therapy with the addition of single dose of primaquine (0.25 mg/kg) [
15
]. This combination
was intended to reduce transmission by targeting gametocytes in confirmed patients.
However, only 109,625 treatment regiments of combined chloroquine/primaquine were distributed
by the Global Fund in 2013; given that only 20,957 patients were confirmed to have malaria,
the majority of these treatments were given empirically [
16
]. Between 2012 and 2013, the
Global Fund also allocated approximately 3 million bed nets (ITN/LLIN) throughout Haiti
free of charge to all age groups in a one-year long mass campaign [
17
]. The only study to
investigate the impact of this one-time distribution in 2012 found that the residual permethrin
content and mosquito knockdown ability met WHO-recommended functional thresholds in all
Departments of Haiti, but between 6 and 30% of the nets failed (total hole area>1000 cm2)
after 12 months and did not appear to be effective for the prevention of clinical malaria (OR =
1.00, P-value 0.971) [
18
]. Since the authors found no evidence of permethrin resistance in
mosquitos reared from larvae collected in the five study departments, they speculated that the
lack of association was due to altered feeding behavior of the primary vector, Anopheles
albimanus, which was observed to bite outdoors or at times when people were not likely to use
nets [
19
]. Additionally, the last phase of the plan (2013±2020) involved indoor residual
spraying and active surveillance to target high-transmission foci; neither of which has been
implemented. Thus, given the proportionally small allocation of effective pharmacalogical
treatments in 2013, most of which were presumptively used, the lack of efficacy demonstrated
by the ITN/LLN distribution in 2012, and the failure to conduct indoor spraying and active
surveillance as planned, we believe it is rather unlikely that such efforts are responsible for the
drastic decline in malaria incidence throughout Haiti.
Regardless of whether the decline in malaria indicators was simply due to the change in
diagnostic approach or a result of elimination activities, the true incidence of clinical infections
and/or prevalence of asymptomatic parasitemia in Haiti remains unclear. Even though the entire
country of over 10 million people is considered at risk for malaria, with over 5 million
considered high risk, the number of people living in active endemic foci also remains unknown [
1
].
Just as active surveillance efforts to estimate the disease burden of malaria in Haiti vary widely
depending on the methods used and the location sampled, passive surveillance estimates depend
on the level of clinical suspicion necessary to administer a diagnostic test and the population
attending the clinic for treatment [
20
]. For instance, microscopic testing in suspected malaria
patients can range from 0 to 14% [
15
], while serological testing of asymptomatic community
members have estimated annual seroconversion rates between 2 and 5% [
21
]. Polymerase chain
reaction (PCR) testing of asymptomatic community-members has estimated a prevalence of
3.1% [
22
], whereas the most recent study using a highly sensitive reverse-transcriptase
polymerase chain reaction (RT-PCR) suggested that asymptomatic parasitemia might be present in 4 to
40% of Haitians depending on location [
23
]. Likewise, the ease of use to diagnose malaria with
RDTs in clinics that were previously not able to perform microscopy could have led to the
inclusion of a patient population that would not normally meet the level of suspicion necessary to
conduct a diagnostic test; blurring the distinction between clinical management of malaria and
clinic-based passive surveillance. One thing is certain, if Haiti is to succeed in malaria
elimination, active surveillance to identify areas with the highest prevalence should precede
interventions, which should include before and after comparisons to determine their efficacy.
One limitation of this study is that there were missing clinic records between 2010 and
2013 due to the devastation from the earthquake, cholera outbreak, and Hurricane Sandy.
Thus, it is clear that the decline in the number of reported cases occurred as early as September
10 / 13
2013, but we were unable to determine if the reduction occurred before that time (ie. directly
after the adoption of RDTs in 2012). Although the numbers from the study clinics matched
the national rates of positive malaria tests when microscopy or RDTs were used in 2010 and
2015, a more extensive dataset would have increased the external validity of this study and
allow for stronger inference regarding the association between this policy change and the
decline in the number of reported cases. The decrease in the TPR could also be attributed to a
relative increase in the number of viral illnesses such as Dengue and Chikungunya, which
were present after the earthquake. However, the absolute number of positive malaria tests also
drastically decreased making this scenario an unlikely reason for the decrease in TPR. Finally,
as reported in other countries, it is possible that the RDTs which utilize HRP2 as the primary
antigen were underdiagnosing patients infected by malaria parasites harboring HRP2 deletions
[
24
]. The presence of HRP2 deletions in malaria parasites along with surveillance for the
development of drug resistance should remain topics of future research in Haiti.
Conclusions
The findings from this study indicate that the drastic decrease in malaria indicators occurred
prior to 2015 after a national change in the method of malaria diagnosis and in the setting of
minimal coordinated elimination efforts. While such elimination efforts or changes in the
environment cannot be discounted, the comparison of 2010 and 2015 indicators as a measure
of progress towards elimination should be made with caution as they were estimated using
different diagnostic methods. As such, we recommend that future interventions proceed with
before and after measurements of malaria indicators to determine their efficacy. Furthermore,
active surveillance measures should be implemented on a national scale to target foci of high
transmission and accurately document future progress towards malaria elimination in Haiti.
Supporting information
S1 Data. Weppelmann et al data.
(XLSX)
Acknowledgments
The authors would like to acknowledge the dedicated staff at the African Methodist Episcopal
Church Service and Development Agency, Inc. (AME-SADA) for access to their clinic records.
In addition, authors would like to thank Nuhira A. Masthan for help with extracting data.
Author Contributions
Conceptualization: Thomas A. Weppelmann, Caroline J. Stephenson, John B. Dame, Michael
E. von Fricken.
Data curation: Caroline J. Stephenson, Elisha Musih, Marie Y. Remy, Robert Nicolas, Michael
E. von Fricken.
Formal analysis: Thomas A. Weppelmann, Caroline J. Stephenson, Michael E. von Fricken.
Funding acquisition: John B. Dame, Robert Nicolas, Michael E. von Fricken.
Investigation: Caroline J. Stephenson, Michael E. von Fricken.
Methodology: Thomas A. Weppelmann, Michael E. von Fricken.
Project administration: Michael E. von Fricken.
11 / 13
Resources: John B. Dame, Marie Y. Remy, Michael E. von Fricken.
Supervision: Marie Y. Remy, Michael E. von Fricken.
Writing ± original draft: Thomas A. Weppelmann, Caroline J. Stephenson, Michael E. von
Fricken.
Writing ± review & editing: Thomas A. Weppelmann, Elisha Musih, John B. Dame, Marie Y.
Remy, Robert Nicolas.
12 / 13
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